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fuel consumption twin 454

Old 11-18-2011, 04:15 AM
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Default fuel consumption twin 454

Purchasing a 1997 33 searay sundancer twin 454 blue water v-drive. Can anyone tell me what the fuel consumption would be?
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Old 11-18-2011, 04:42 AM
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Ask the seller and then add 20%.
Based on what I've gotten with 454 singles I would guess you'll burn around 24-26 gallons per hour at an easy cruise speed. Not sure why more haven't chimed in here.
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Old 11-18-2011, 04:47 AM
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I had a 1991 with nearly the same package. I never calculated it exact but agree that 12-13 gph per engine at about 3,200 was close. Didn't have GPS then but speeds would have been high 20's.......maybe 30 on a good day (we kept ours slam full of crap as it was the weekend condo with a couple kids)
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Old 11-18-2011, 04:50 AM
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Don't know enough about that particular boat to be precise, but twin 454's typically burn 24-26 gph at 3,000 rpm, which I would suspect will be about 18-19 kts on that boat (assuming its economy is similar to a 33' Tiara with the same engines), and 32-34 gph at 3,400 rpm, which would likely be in the 22-23 kts range.
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Old 11-18-2011, 05:00 AM
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I have the 34 Amberjack that's a bit heaver and I burn 32 GPH, at a speed of 23 knots.
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Old 11-18-2011, 05:03 AM
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.75 mpg
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Old 11-18-2011, 05:18 AM
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On that boat I think 15gph ea engine is about right. Had a 33 bertram with those engines and got 18gph per engine. The bertram is quite abit heavier than the SR.
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Old 11-18-2011, 05:34 AM
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Figure .5 to .75 mpg.....
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Old 11-18-2011, 08:58 AM
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Around 35 gallons per hour. Those low numbers are wishful thinking for 33 foot boat.
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Old 11-18-2011, 09:10 AM
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On my 35' Bertram, a much heavier boat, I run about two hours each way at 18 knots, troll all day, and burn around 180 gallons a day.

You should do a bit better with a lighter boat with a flatter transom.

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Old 11-18-2011, 09:23 AM
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Ran an 84 Silverton convertable with T220 Crusaders for 20+ years. Getting her best cruise (just rolled over the bow wave) was 3200-3400 RPM and 18-20 knots using 8-10 GPH per engine. Topping out around 4200-4500 RPM would do 26-27k and burn 14-16. Neighbor had similiar boat with the big block T270's and would burn app. 20 - 30% more with maybe 10-15% more speed.
Looking back hauled around too much 'junk' on board and probably needed to swap screws for best GPH.
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Old 11-18-2011, 10:04 AM
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I had a 1990 33 foot Sea Ray with carburated 454's and v-drives many years ago. At cruise, which if I recall was in the low 20's (kts) it would get around .67 nmpg.
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Old 11-18-2011, 10:27 AM
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As above... Probably avg ~.67 mpg (nmpg if you're lucky & take it easy). I'd predict ~.75mpg at best cruise speed...
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Old 11-18-2011, 01:50 PM
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Originally Posted by fishtales66 View Post
I had a 1990 33 foot Sea Ray with carburated 454's and v-drives many years ago. At cruise, which if I recall was in the low 20's (kts) it would get around .67 nmpg.
These #'s would be close. Do yourself a favor and have the trim tabs extended 3-4 inches. It will control the bow rise at mid range and improve fuel economy by 10-15% also. These Sea Rays and many other boats have trim tabs that are way under sized and can create excessive bow rise and poor fuel economy.
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Old 11-18-2011, 02:25 PM
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35 gallons per hour. $4-$5/gallon. Meowch.
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Old 11-18-2011, 05:22 PM
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Originally Posted by LI32 View Post
Don't know enough about that particular boat to be precise, but twin 454's typically burn 24-26 gph at 3,000 rpm, which I would suspect will be about 18-19 kts on that boat (assuming its economy is similar to a 33' Tiara with the same engines), and 32-34 gph at 3,400 rpm, which would likely be in the 22-23 kts range.
These numbers are spot on for my 33 with 454 carb'd crusaders.
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Old 11-18-2011, 07:05 PM
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.6 -.7 mpg at cruse Push it and it will drop .
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Old 11-18-2011, 07:50 PM
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Originally Posted by prowlersfish View Post
.6 -.7 mpg at cruse Push it and it will drop .
That would be my guess. Some of the better economy estimates above are hard to believe, considering that in a properly tuned modern gas engine, it takes at least 19 gph to put out 200 hp, and I doubt that boat could do much better than about 24 knots with less than 400 total hp. If the engines put out 320 hp max, then you are looking at total consumption of over 60 gph.
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